Mechanical telephone



(No Model.)

- J. LAUHOEP.

MEGHANIQAL TELEPHONE. v No. 365,525. Patented M11628, 1887.

W1 TJvEssEs .dttorney UNITE STATES PATENT OFFICE.

JOSEPH LAUHOFF, OF DETROIT, MICHIGAN.

MECHANICALITELEPHONE.

SPECIFICATION forming pali. of Letters Patent No. 365,525, dated June 28, 1887. Application filed August 21, 1896. Serial No. 211,547. (No model.)

To aZZ whom, it may concern:

Be it known that I, JOSEPH LAYUHOFF, of Detroit, county of Wayne, State of Michigan, have invented a new and useful Improvement in Mechanical Telephones; and I declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to certain new and usef ul improvements in mechanical telephones, my object being to provide a telephone of this class which shall be simple in construction and efficient in its operation. v

My invention therefore consists in the combinations of devices and appliances hereinafter specified, and more particularly pointed out in the claims.

I carry out my invention as follows:

In the drawings, Figure 1 is a vertical section of a device embodying myinvention. Fig. 2 is a front View with the front diaphragm removed. I

A repr'eseuts any suitable inclosing-case, constructed with a front orifice, a, of desired diameter, and provided at its rear with an orifice, a, through which the line-wire or steel tape B is extended.

0 is a tubular shell, supported within the case A in any suitable manner, as by means of a bracket, D. To form the engagement of the shell with the bracket, a collar, E, may be employed, the collar being engaged to the shell and to the bracket.

F represents a rear diaphragm engaged upon the shell, provided with an orifice at 6, through which the line-wire passes.

F represents the front di.phragm removably engaged upon the forward part of the shell. b is the button by which the linewire is connected with this front diaphragm. The rear diaphragm preferably has a fixed engagement in the shell. The front diaphragm is supported upon a ring, G, said ring constructed so as to form a sharp contact-edge, on which the diaphragm is located.

9 g, &c., represent supports for the ring.

. These supports are engaged at their base with an annular bed-piece, G.

H is a rim located on the inside of the shell, to form a rest for said bed-piece.

It will be observed that the shell, the rear diaphragm, and the front diaphragm form a sounding-chamber partially divided by the bed-piece G, said bed-piece having a removable engagement upon the rest II, so that said bed-piece and front diaphragm engaged upon the edge of the ring G are left free to vibrate.

What I claim is- 1. In a telephone, the combination, with the removable bed-piece G, of a ring, G, en-

gaged therewith by intervening supports, substantially as described.

2. In a telephone, the combination, with a removable bed-piece, G, of a ring engaged therewith by intervening supports, and a removable diaphragm located upon said ring, substantially as described.

3. In a telephone, a soundingchamber provided with front and rear diaphragms, said chamber divided by a removable bed-piece, G, the front diaphragm removably engaged upon a ring support on said bed-piece, substantially as described.

4. In a telephone, the combination, with a shell, of front and rear diaphragms connected therewith, and a removable bed-piece supported Within said shell, the front diaphragm removably engaged upon a ring supported upon said bed-piece,substantially as described.

5. A mechanical telephone constructed of a case having in combination therewith an inner shell provided with front and rear diaphragms inclosing a sounding-chamber, and a movable bed piecelocated within said shell,the front diaphragm removably engaged upon a ring supported. on said bed-piece and provided with a line-wire or steel tapc,,subslantially as described.

6. In a telephone, a sounding chamber provided with front and rear diaphragms, and a movable bed-piece located within said sounding-chamber, provided with a ring supported thereon, the front diaphragm removably engaged upon said ring and held in contact therewith by a line-wire or steel tape, the construction being such that said front diaphragm and bed-piece are free to vibrate, substantially as and in the manner described.

In testimony whereof I sign this specification in the presence of two witnesses.

JOSEPH LAUHOFF. 

